Showing posts with label science. Show all posts
Showing posts with label science. Show all posts

Monday, 14 September 2015

Halloween 2015

Halloween 2015

If you are familiar with this blog, you will know that our family really tends to get into the Halloween season.

I prefer the subtle and mysterious rather than the blood-and-gore approach to Halloween spookiness.

We have moved into a new neighbourhood with many more children, so I plan to set up the Mad Scientist station in the driveway again this year. This is not to be confused with the company of the same name!

In the past, we have had a couple of Jack O'Lanterns set up with dry ice, and had kids mix their own homemade play dough (for younger kids) or silly putty to keep as their Halloween treat in labelled freezer bags.

This year, I plan to add to it by doing  a little more with the dry ice (cabbage water and dish soap, screaming spoons, etc.). I also found this simple physics trick to share with kids (I will call the water "possessed" or haunted). In this trick, you use the properties of refraction and reflection to reverse the direction of an arrow drawn on a card behind a glass of water. 
On a similar theme, I'll have a bicycle pump available to make a cloud in a bottle (aka "Ghost in a Bottle") using rubbing alcohol and a 2 litre plastic bottle.

I'd love to do more in the way of activities, but many kids are in a hurry that night. Sometimes it can be hard to compete with a sugar rush!

For decor, we may make plastic wrap and packing tape ghosts lit with cool-white LED Christmas lights to decorate the lawn and veranda too. Perhaps they will be emerging from graves.

I'd like to make a model owl with glowing eyes to sit in our lonely tree out front and/or a way to make our tree look possessed (eyes, make branches look like hands etc.). I have yet to find an idea that I like for these though.

I have a 20+ year old "spooky music" cassette tape I've been using that I really should update. In researching music for it, I found an easier Halloween music solution. There are many live streaming options available with a quick internet search. All you need to do is choose the one that suits your crowd and function best. Here's one I found, but really, there are many options out there!

While that goes on, we will rotate so that two of us from our family will also be canvassing the neighbourhood for Halloween for Hunger to collect non-perishable items for the local food bank. Be sure to have food items handy for such drives in your area! Click on the superhero image for more information.

More Halloween party ideas from past years:
http://lemonadebyll.blogspot.ca/2010/10/great-green-halloween-tips.html
http://lemonadebyll.blogspot.ca/2013/09/planning-ahead-for-halloween.html
http://lemonadebyll.blogspot.ca/2011/10/halloween-science.html

On the website, http://llemonade.com/halloween, there are many more activities and links to match the season as well.

Wednesday, 4 April 2012

Endangered: Science & Creative Thinking

Science Image

Yesterday I had the pleasure of attending our regional science fair. This is the second year I have attended. Last year there were approximately 300 projects presented by students in grades 7-12; this year there were about 230. Some of the projects show a great deal of creativity, sometimes in terms of the question being asked, sometimes in the experimental design. It is exciting for me as a teacher to be surrounded with bright, motivated and enthusiastic students.

I've only been to two fairs, so calling my observations "a trend" is probably going a little too  far, but I did notice a few things that I found disturbing. Many student science projects that made it through the initial in-school fairs to get to the regional fair were more replications and demonstrations than actual original science. These sorts of projects were numerous, far outnumbering projects which incorporated original approaches to a problem. A couple of kids even proudly mentioned the websites from which their experiments originated. While they should be encouraged to give full disclosure (a point which I'll return to later), and while replication is an important aspect of scientific study, when I see an experiment that I've seen a dozen times before with no new questions or adaptations, I question the fact that it has made it to this level of competition.

For example, many students have made potato batteries. The experiment which used a variety of fruits & veggies, tried them in both parallel and series and used the energy to perform electrolysis took the idea further than the basic experiment. Unfortunately,  there were many similar ones that were stalled at the equivalent of the potato battery stage, yet made it into the regional fair. There were more of these this year than last, even though the total number of entries was significantly lower. The proportion of higher level prizes to entries was also lower, reflecting an overall drop in quality of the entries submitted.

To be fair, there were a number of truly inspiring projects which showed creativity, innovation, depth and impressive research skills, but these projects were fewer than last year, and stood out from the rest.

Not only are many of the projects generally lacking creativity, depth and innovation, some of the students do not seem to understand the scientific process. There were several projects in which the conclusions stated that their experiment "proved" or "disproved" their hypothesis. Some of the actual concepts and methods were flawed, misinterpreted or misunderstood. Since only a handful of projects were directly entered (from home-schoolers  and students whose schools do not participate in science fairs), and the rest went through the rigors of the in-class and then the school-wide fairs in order to make it this far, the fact that none of the teachers or judges who previously evaluated the project caught this is something I find rather disturbing.

Maybe this is just a fluke and next year will see more innovation and creativity (and scientific rigor). I fear though that this is a trend that will continue. In many ways, it can be argued that it started a while ago when standardized testing became so popular.

There is a trend present in all levels of education for students to ask "will it be on the test?" then ignore any discussions that do not gain a "yes" answer. Getting the "right" answer trumps exploration and discovery through experimenting and taking risks. Divergent education and thinking go hand in hand with creativity which drives innovation. Standardized tests, by their very definition, encourage students to memorize and accept rather than to truly understand.

Getting the "right" answer relies on taking others at their word rather than testing ideas. Back in the middle ages in Europe, the teachings of the ancient Greek philosophers were accepted without question. It was only in the age of enlightenment, when Galileo and other scholars began to question and test ideas that science and innovation were reborn. By reverting back to a "get the right answer" mentality, we are reverting back to thinking patterns common in the dark ages.

A grade 8 student I know showed me his school science binder this year. The class studied the seasons. Now, at a grade 8 level, I would have expected to see details such as how the angle of the earth's rotation affects the seasons, seasonal variations, comparisons between various locations, climate (OK, perhaps not that one--we do live in Canada after all!), animal and plant adaptations & comparisons over varying zones, etc. What they actually did looked like something out of preschool. They had to determine which holidays and sports fell into which seasons. The entire term test went no further than this.

When science instruction is watered down this far, how can we possibly expect to move forward as a society? Which brings me to another point: the Harper gov't cuts to scientific research. When there is a pronounced disinterest by the government itself in pursuing science and innovation, what hope can we have that students will be drawn into these fields? But let's get back to the education discussion...

The effects have reached into post-secondary education as well. I have friends who teach or are professors at five different post-secondary institutions and they all report the same attitudes. Students tune out or leave lectures if they stray at all from the exact questions they will see on the test. Students use references such as Wikipedia for major papers, or copy papers directly from Wikipedia or other internet sites. Often this is easily checked by plugging in the first couple of sentences as part of a search term. Plagiarism is becoming the norm, and students aren't even trying to hide it. Moreover, they plagiarize even for smaller assignments that are not worth many marks. One friend reported being able to track the plagiarized bits in a paper because the student hadn't even bothered to change the font in the sections he lifted directly from the internet. Another friend was asked to "go easy" on the students because they didn't know better. So instead of losing their degree entirely and being expelled from the university, they simply failed the course. This professor learned to copy the university's policy on plagiarism for the first class of each term, read through it with his students and have them sign and return a copy. How on earth could students have graduated from highschool and not learned about the legal aspects of stealing/buying/copying someone else's work? Perhaps post-secondary institutions are not demanding enough of their entrants. It seems that every student now feels entitled to a post-secondary education. Many students might be happier and more suited to learning a trade or pursuing other non-academic vocations.

Perhaps I'm a bit naive. When I went to university, I found great pleasure in learning about and researching new topics. It was hard work, especially as I took on a double major which meant double the course load for much of my time there, but it was interesting and compelling. The piece of paper at the end was just another piece of red tape needed to gain employment; the substance and worth were in the process itself. Have we robbed the current generation of such pleasures? Maybe part of the difference is that I chose my majors not for the ultimate goal of making a great deal of money, but out of a true interest in the subject matter. (And before you jump to any conclusions of me being a pampered little rich kid, you need to know that I paid for every cent of my education through working three part-time jobs and taking on a huge student loan.)


Science education should be an extension of the natural curiosity and experimentation of young children. In fact, when allowed to play freely, particularly outdoors, children are natural scientists. To encourage children to continue their explorations throughout childhood and into adulthood is to develop creative, critical, scientific thinkers. Yet how often do we miss the opportunity to delve into further investigation with our children, and instead guide them away from their natural interests? Maybe it's too hot, cold, muddy, or doesn't fit into our schedule or agenda. But it should. To revert to rote teaching as a top-down activity is to stifle all that is good and natural about learning. Just ask any developmental psychologist and they will tell you--or look up the studies yourself. Yet the push in education is for all-day, indoor, top-down instruction even in kindergarten. Outdoor play and outdoor education are increasingly infrequent activities rather than the norm.

When teachers become guides and mentors, students thrive. When it becomes all about standardization, learning suffers. Creativity is squashed like a bug (which many kids can no longer recognize or name). Self-directed learning is an unknown entity. Choices become threatening and overwhelming to students who have been given little or no experience with making any decisions for themselves. Reflective thought, questioning and probing-these are all discouraged in the name of expediency. But when expediency has no true goal (consumerism aside), we simply end up running faster and faster and get nowhere. And that is precisely where our current system is heading.

Thursday, 1 December 2011

Celebrating a STEM Holiday Season

STEM is an acronym that stands for Science, technology, engineering & mathematics.

Adding a little STEM to the holiday season is a great way to have a little geeky fun.

Math

Mobius Paper Chains:
Liven up the traditional paper chains by giving each link a twist before fastening. Try making a thicker link on its own, then cut it down the centre to see what happens. You can use a few of these for your chain as well.  Try cutting a strip 1/3 from the edge all around. What happens?

Stars & Angles:
What kind of star do you get when you join up all the corners of a square? Pentagon? Hexagon? Septagon? Octagon? Calculate the angles involved in each of these. What is the sum of the angles for each of the different stars?
Now try drawing a triangle on a sphere (a balloon or Christmas ball will work well). Measure the angles of this triangle. What do you notice about their sum? What might this mean if you were to draw one of the stars on a sphere? Try it and see if your predictions hold.

For the younger set:
The Twelve Days of Christmas song lends itself well to learning ordinals (1st, 2nd, 3rd, etc.), and at the end you can add up all the gifts the "true love" gave. Can you find a shortcut for adding successive numbers?

An Advent Calendar as well as a regular calendar can reinforce counting up and counting down skills.

Science
A few chemistry concoctions lend themselves well to Christmas.

Crystal window paint: This easy-clean recipe uses epsom salts to make a crystal pattern on any glass surface.
Crystals:
  Use this salt solution recipe to paint crystal patterns for cards and gift tags.
  Make a classic borax crystal ornament (remember when you did this as a kid?)
Snow:
  Use one of these recipes to make either shaving-cream or soap-based indoor "snow" dough.
  Paint the snow with spray bottles.
Don't forget to take a little time out for a nature walk and some star gazing too!

Engineering
Design your own Rube Goldberg machine to deliver a gift to a loved one, or make it a little simpler and set up your electric or wooden train around the tree to do the same thing.
Make and use some squishy circuits (playdough recipes that conduct and resist currents) to make a light-up Christmas tree, Rudolph, etc.

Technology
Design an electronic gift card, video greeting or holiday game using one or more of the following:
Scratch drag-and-drop computer programming tool from MIT
Windows paint
Picasa (try making a mosaic creation too!)
Photoshop
MS Movie Maker
Muvee
Or any other photo, drawing, graphics, video or word processing programs you like.
Or try Make-a Flake for some addictive mess-free snowflake making.

Remember, many more math & science activities can be found on the Lemonade website.

Tuesday, 18 October 2011

Halloween Science

 It's Halloween! Time to don your lab coat Mwahaha!

There are lots of strange & spooky science activities on Lemonade that are perfect for sharing at  Halloween, so I thought it might be a good idea to put them all together here so they can be easily accessed from one place. 

Halloween lends itself to lots of strange science activities, from spooky dry ice experiments, to cosmic black light effects and strange magical potions that disappear and reappear, that change colour unexpectedly or become slimy and ooze.

You can make your own shrunken heads from carved and dried apples (it will be as if those apple dolls your grandparents made became apple zombies).

It's also a time to look at some truly bizarre creatures , even more bizarre creatures and maybe do a little owl pellet detective work. If you have access to a microscope, you can see a whole world of alien-looking creatures--from pond critters & close-up insects to bacteria (in fact, you may want to try and culture some bacteria of your own--see below). Strange & spooky science effects can also be found in the kitchen with possessed dancing raisins & living sludge bread (yeast & sourdough).

To culture bacteria, you will need a petri dish (or clean, clear container), some powdered agar (you can find this at health food stores and science suppliers), chicken broth (to use as a nutrient base), cotton swabs, and a place to store the samples. Boil the chicken broth then add the agar and stir well. Pour the mixture into petri dishes, cover and refrigerate to set.

Use the cotton swabs to collect samples from anywhere you suspect germs & bacteria may be found. Try doorknobs, computer keyboards, pet mouths, human mouths--and so on. Gently brush each swab along the top of a gel, label and seal the dish. Repeat for each sample. Store the samples at room temperature, or experiment with making several copies and storing at various temperatures for several days or even weeks. Examine your results under a microscope if possible.

Of course, if you are doing this as a controlled experiment, you will need to be much more careful about preparing and storing the cultures in order to avoid contamination, but for pure exploration, these instructions should suffice.

Other ways to culture bacteria can be edible, such as making your own yogurt or cheese. In fact, when you eat yogurt, you are actually eating live bacterial cultures--poor things! They're being EATEN ALIVE!!!

More weird science can be found here.

Happy haunting!

Wednesday, 23 March 2011

Thoughts on Nuclear Power

Due to concern about the reactors in Japan, there has been much talk about the fate of nuclear power in recent days. Is there a future for nuclear power?

I must admit that I am torn on the question. Nuclear power is not safe, at least not the way it is built, used and run by corporate and government entities around the world. But is there a way we could make it safe? In theory, it looks pretty good, but the reality is a little more complicated.

Nuclear power is cheap, until you take a closer look. First, there is the mining of uranium and other related minerals to consider. Then there is the building and maintaining of reactors, and most of us are aware of the shortcuts that have been taken in both of these, particularly in maintenance. I find it unbelievable to hear how the Mox fuels are being used, and how storage of spent fuel is designed close to the reactors. IMO, this is carelessness in the name of profit. This isn't only about Japan. By all accounts, the Japanese are dealing at least as well with this as any other country possibly could at this time.

If we were to incorporate every available safety precaution into the design of reactors, including the storage of spent fuel; and if we were to run the plants on a strict safety policy in which business models of "cost/benefit analysis" and "insurance risks" based purely on probabilities tallied against financial and political motivations were replaced with the calculation of risk to life and health as the only consideration, then perhaps there might be a place for nuclear power. However, the current realities show us that this simply isn't the case, and isn't likely to happen anytime in the near future. Nuclear power is cheap until there are accidents. And the cheapness of this source fails to take in some very real costs--even before disaster strikes. Government subsidies hide some of the costs. Uranium mining is costly in social, economic and especially environmental terms. The actual running of reactors, including maintenance, can become costly, particularly if public and employee safety is prioritized (as it should be). The lifespan of reactors is relatively short, although in many cases has been pushed beyond original design limits, again, due to economic and political concerns.
I have read conflicting reports about cancers and other radiation related illnesses in people living close to nuclear power plants; since I am no expert, I will leave that argument out for the time being. However, there is no doubt that there are safety concerns for the people who live near nuclear disaster zones, and also for the storage of spent fuel.

Spent fuel is often buried deep, however, geological disturbances happen, and are more likely to happen when the "safe" time frame reaches into the realm of tens of thousands of years or more. Moreover, this is costly disposal, and it is only a matter of time before those in charge start taking shortcuts (assuming of course, that that hasn't already happened).

One thing that generally does not enter into the discussion is the idea of  cost/benefit analysis in terms of time. In a best-case scenario, with no further nuclear accidents, leaks, etc., there is still the issue of spent fuel. The half-life of spent fuel, and the resulting large time lag between its use and the time in which it can be safely handled by unprotected people means the problems associated with its radioactivity will exist far into the future and affect many generations. Its useful production time and power is relatively minuscule in comparison.

Several years back some researchers mistakenly thought they had found the modern holy grail: cold fusion. Unfortunately, they were mistaken. Perhaps it is time for a new "X Prize" in energy research. Until then, we would be wise to eliminate our subsidies to dirty energy including fossil fuels and invest instead in renewable energy technology and conservation research and incentives. We can't afford to complacently continue on our current path.

Wednesday, 5 May 2010

Science calls

I'm not sure why it is, but the most interesting sites and resources I find tend to be somehow science related. I guess, when it comes down to it, most things are science related in some way.

I recently picked up powdered agar from a health food store. This is an incredibly versatile food. It can be used as vegetarian gelatin, with the unique characteristic that it can be melted down again and re-jelled if you wish to adjust the consistency etc. It can also be used as a culture medium for bacteria--the classic "ew" experiment!

Sometimes the "ew" factor can be a compelling motivator for kids.
borax slime experiment
Some of the favourite science activities our family has done include making kid concoctions such as: slime, ooblick, magic mud and silly putty (especially great for preschoolers/kindergarten kids), identifying animal scat on hikes, dissecting owl pellets (not gross at all in reality, but certainly popular and interesting!), examining insects, pond studies, vermicomposting / backyard composting and identification of decomposers, and exploring alkalinity with red cabbage water indicator (smelly but pretty to see!).

In the near future we'll be trying out some bacterial culturing and possibly some forensic experiments from here.

Wednesday, 28 April 2010

Cool New Chemistry Site I Found

Just a quick post to share a new chemistry site I found: http://www.creative-chemistry.org.uk/index.htm

I especially like the forensic section under "activities" that has instructions for flame tests and urine analysis. It seems aimed fairly young--I'd say grades 4-8 but does expect a full chem lab, so will be a little challenging for us as homeschoolers. I know you can get "portable" bunsen burners (with their own fuel cannister) and required chemicals but I've yet to find a local source.

When I get to it, I will add this link to my website as well.

Tuesday, 23 March 2010

Science, because I want to

My elementary school did not have a science lab or even  a science teacher, so when I reached high school, I was unfamiliar with the workings of bunsen burners and didn't know the difference between a beaker, a test tube and a flask. In grade 9, I was in a class with kids who had to repeat it, so they always gathered the equipment and set it up while I read the experiment and wrote it up.
crystal growing jars
tinted borax crystal ornamentIn grade 10, when I asked my physical science teacher what I needed, he accused me of being difficult, and from that point on, refused to answer any questions I or my lab partner had. We were the "giggling girls" (which only got worse over time), and he was never interested in seeing us as curious, intelligent students. The curriculum didn't help. Levers and pulleys could have been much more interesting--just ask my kids! Why were we only beginning to study that in grade 10? He gave us more academic credit for washing the glassware (doing the dishes) than for actually doing any science.


slime silly putty polymerBut I was always very curious, and would not let the stereotyped opinions of this so-called teacher ruin that. Ever since then I have made a point of learning what I could, on my own, about physics, albeit from a layperson's perspective. For me it is pure entertainment. I gain pleasure in learning what I can and passing it on enthusiastically to others. It is in this spirit that I have introduced my kids to kitchen chemistry, Rube Goldberg machines, model rocketry, and amateur astronomy. My kids have enjoyed exploring fractal patterns, discussing mind experiments about black holes and dark matter over dinner, and wondering about the nature of potential extra dimensions as postulated by string theory. And why shouldn't they? These are the topics that tickle the imagination and make you come back again asking for more.


egg after shell dissolved in vinegarThese are the interesting things--the "what ifs", the wonders of things yet to be discovered as well as the exclamations of delight upon mixing glue and borax to get a strange polymer, the fascination of making cabbage water turn every colour in the rainbow, and figuring out what makes that happen. If the kids can know that awe and wonder about the world, and maintain it throughout their lives, I believe I will have attained something Mr. Penton never could. Maybe, in that sense, Mr. Penton did my family a favour.

In this spirit, I have shared some of our science experiments and resources we have enjoyed on Lemonade: http://www.greensim.com/lemonade/science.html 

Wildlife Videos to Share

Some very cool and interesting wildlife footage to see, as tweeted by @BillNigh:

Nesting farm owl, streaming:
http://www.ustream.tv/theowlbox#more

Seahorse dad giving birth to 100's: (yes, seahorse dads carry the babies!)
http://ow.ly/1pQEL

I may need to start looking for more wildlife streaming again. We've followed eagles and orcas in the past and enjoyed both immensely! It's a nice change from the wildlife documentaries that emphasise only feeding and mating; when you watch streaming video of an animal you get to see all the behaviour, whether or not the sponsors feel it will sell cars or beer or whatever.

If you like the barn owl, why not try dissecting barn owl pellets? You can order pellets from a science supplier online and download a free bone chart as well from here: http://www.kidwings.com/teacher/owlpellets/index.htm We have done this and it is incredibly interesting and not messy or unpleasant like you might fear. It kept all the kids at our party enthralled for over an hour, then after the food they hurried back for more. We were able to put together several complete vole skeletons. There is really just bones and fur in the pellet, and the suppliers heat-sterilize them. You can also collect them yourself and do it, just be sure to wash up well afterward!

Friday, 19 March 2010

Galaxy Zoo

I saw this today and it looks interesting. I like it when "ordinary folks" can participate in science. We can use any kind of event or activity that helps people relate to science.
At this link, you can observe an image of a galaxy, then answer a few simple questions about it to help add to data collected to determine various characteristics about a region of space.

http://www.galaxyzoo.org/how_to_take_part